PICK OF THE DAY

THE NEST

9PM, BBC1 ★★★★

As the pregnancy of teenage surrogate mum Kaya progresses, this drama gets murkier and murkier. Kaya is struggling to leave her difficult past behind her, but she’s not the only one with something to hide. The body found in the Clyde attracts the attention of an ambitious young journalist, and dark secrets swirl around Dan’s Glasgow business deals. As tempers fray,

Emily (Sophie Rundle, right) is trying desperately to stay calm and not fuss over Kaya too much. It seems, however, that all those around Emily are steadily losing their cool.

BLUE PLANET REVISITED: A SHARK’S TALE

5.35PM, BBC1 ★★★★

The 700 islands that make up the Bahamas are home to one of the planet’s most diverse shark populations. In this new series, Steve Backshall meets conservationists, scientists and locals to learn more about these remarkable creatures – and the marine ecosystem that they help to maintain.

SECRETS OF EGYPT’S VALLEY OF THE KINGS

8PM, CH4 ★★★★

At a key point in the history of ancient Egypt, the great Pharaohs abandoned the Pyramids of Giza and made the Valley of the Kings the location of a secret burial ground. This documentary follows archaeologists as they explore a rare 4,500-year-old tomb in search of answers.

BELGRAVIA

9PM, ITV ★★★★

So far, the focus has been keenly on upstairs rather than downstairs, but in part three, there’s a greater sense of what the staff understand of their employers’ affairs. As the Reverend Bellasis’s financial situation grows desperate, he and his devious son decide to look more closely at the mysterious Charles Pope. SA